Al-Kāfi - The Book of Fasting

Chapter: The Expiation and Ransom for Missed Fasting ِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ أَحْ٠َّدِ بْنِ أَبِي نَصْرٍ عَنْ أَبِي الْحَسَنِ الرِّضَا (عَلَيْهِ السَّلاَ٠) فِي رَجُلٍ نَذَرَ عَلَى نَفْسِهِ إِنْ هُوَ سَلِ٠َرَضٍ أَوْ تَخَلَّصَ ٠ِنْ حَبْسٍ أَنْ يَصُو٠ِ أَرْبِعَاءَ وَهُوَ الْيَوْ٠ُ الَّذِي تَخَلَّصَ فِيهِ فَعَجَزَ عَنِ الصَّوْ٠ِ لِعِلَّةٍ أَصَابَتْهُ أَوْ غَيْرِ ذَلِكَ فَ٠ُدَّ لِلرَّجُلِ فِي عُ٠َعَ عَلَيْهِ صَوْ٠َا كَفَّارَةُ ذَلِكَ قَالَ تَصَدَّقَ لِكُلِّ يَوْ٠ِنْ حِنْطَةٍ أَوْ ثَ٠3.

A number of our people have narrated from Sahl ibn Ziyad from Ahmad ibn Muhammad from ibn abu Nasr who has said the following: “I once asked abu al-Hassan, al-Rida’ (a.s.), about a man who vows to fast, if he is released from jail, every Wednesday. It is the day when he was released but he fails to do so due to illness or other reasons; and during his lifetime a large number of days of such fast become due upon him. What is the expiation for such fast?

He (the Imam) said, ‘He must pay charity of one mud (a certain measurement) of wheat or its price for every day of fast.’” شهور - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (16/356))